A number of books for preppers are $2.99 today.
The Emergency Survival Manual: 294 Life-Saving Skills (Outdoor Life)
https://www.amazon.com/dp/B01E64EKSS
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The Ultimate Survival Manual: 333 Skills That Will Get You Out Alive (Outdoor Life)
https://www.amazon.com/gp/product/B00TIROATI
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When All Hell Breaks Loose: Stuff You Need to Survive When Disaster Strikes
https://www.amazon.com/dp/B00B08XOTA
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Mini Farming: Self-Sufficiency on 1/4 Acre
https://www.amazon.com/dp/B004ULMJ2C
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Prepper's Natural Medicine: Life-Saving Herbs, Essential Oils and Natural Remedies for When There is No Doctor
https://www.amazon.com/dp/B00PSSK0G8